Patients were aged 18 years or older, had stage IIIb or stage IV ALK-positive NSCLC that had progressed while they were on crizotinib therapy...Tumours with the secondary resistance mutations F1174L/V (objective response in five [71%] of seven patients with this mutation), G1269A (four [67%] of six), C1156Y (five [71%] of seven), and T1151 (two [67%] of three) were especially sensitive to ensartinib...Table 4: Efficacy of ensartinib by ALK mutation type...